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  • Security for VPNs with IPsec Configuration Guide, Cisco IOS Release 15S

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  • C O N T E N T S

    C H A P T E R 1 Configuring Security for VPNs with IPsec 1

    Finding Feature Information 1

    Prerequisites for Configuring Security for VPNs with IPsec 2

    Restrictions for Configuring Security for VPNs with IPsec 2

    Information About Configuring Security for VPNs with IPsec 3

    Supported Standards 3

    Supported Switching Paths, and Encapsulation 5

    Supported Hardware 5

    VPN Accelerator Module Support 5

    AIMs and NM Support 5

    Supported Switching Paths 7

    Supported Encapsulation 7

    IPsec Functionality Overview 8

    IKEv1 Transform Sets 8

    IKEv2 Transform Sets 8

    IPsec Traffic Nested to Multiple Peers 9

    Crypto Access Lists 9

    Crypto Access List Overview 9

    When to Use the permit and deny Keywords in Crypto Access Lists 10

    Mirror Image Crypto Access Lists at Each IPsec Peer 12

    When to Use the any Keyword in Crypto Access Lists 13

    Transform Sets: A Combination of Security Protocols and Algorithms 13

    About Transform Sets 13

    Cisco IOS Suite-B Support for IKE and IPsec Cryptographic Algorithms 15

    Suite-B Requirements 16

    Where to Find Suite-B Configuration Information 16

    Crypto Map Sets 17

    About Crypto Maps 17

    Security for VPNs with IPsec Configuration Guide, Cisco IOS Release 15S iii

  • Load Sharing Among Crypto Maps 18

    Crypto Map Guidelines 18

    Static Crypto Maps 19

    Dynamic Crypto Maps 19

    Dynamic Crypto Maps Overview 19

    Tunnel Endpoint Discovery 20

    Redundant Interfaces Sharing the Same Crypto Map 22

    Establish Manual SAs 23

    How to Configure IPsec VPNs 23

    Creating Crypto Access Lists 23

    What to Do Next 24

    Configuring Transform Sets for IKEv1 and IKEv2 Proposals 24

    Restrictions 25

    Configuring Transform Sets for IKEv1 25

    What to Do Next 26

    Configuring Transform Sets for IKEv2 27

    Transform Sets for IKEv2 Examples 28

    What to Do Next 29

    Creating Crypto Map Sets 29

    Creating Static Crypto Maps 29

    Troubleshooting Tips 32

    What to Do Next 32

    Creating Dynamic Crypto Maps 32

    Troubleshooting Tips 36

    What to Do Next 36

    Creating Crypto Map Entries to Establish Manual SAs 36

    Troubleshooting Tips 39

    What to Do Next 39

    Applying Crypto Map Sets to Interfaces 39

    Configuration Examples for IPsec VPN 41

    Example: Configuring AES-Based Static Crypto Map 41

    Additional References 42

    Feature Information for Configuring Security for VPNs with IPsec 44

    C H A P T E R 2 IPsec Virtual Tunnel Interfaces 47

    Security for VPNs with IPsec Configuration Guide, Cisco IOS Release 15S iv

    Contents

  • Finding Feature Information 47

    Restrictions for IPsec Virtual Tunnel Interfaces 48

    Information About IPsec Virtual Tunnel Interfaces 48

    Benefits of Using IPsec Virtual Tunnel Interfaces 48

    Static Virtual Tunnel Interfaces 49

    Dynamic Virtual Tunnel Interfaces 49

    Dynamic Virtual Tunnel Interface Life Cycle 50

    Routing with IPsec Virtual Tunnel Interfaces 51

    Traffic Encryption with the IPsec Virtual Tunnel Interface 51

    How to Configure IPsec Virtual Tunnel Interfaces 52

    Configuring Static IPsec Virtual Tunnel Interfaces 52

    Configuring Dynamic IPsec Virtual Tunnel Interfaces 54

    Configuration Examples for IPsec Virtual Tunnel Interfaces 56

    Example: Static Virtual Tunnel Interface with IPsec 56

    Example: Verifying the Results for the IPsec Static Virtual Tunnel Interface 58

    Example: VRF-Aware Static Virtual Tunnel Interface 59

    Example: Static Virtual Tunnel Interface with QoS 59

    Example: Static Virtual Tunnel Interface with Virtual Firewall 60

    Example: Dynamic Virtual Tunnel Interface Easy VPN Server 61

    Example: Verifying the Results for the Dynamic Virtual Tunnel Interface Easy VPN

    Server 62

    Example: Dynamic Virtual Tunnel Interface Easy VPN Client 62

    Example: Verifying the Results for the Dynamic Virtual Tunnel Interface Easy VPN

    Client 63

    Example: VRF-Aware IPsec with Dynamic VTI 64

    Example: Dynamic Virtual Tunnel Interface with Virtual Firewall 64

    Example: Dynamic Virtual Tunnel Interface with QoS 65

    Additional References for IPsec Virtual Tunnel Interface 66

    Feature Information for IPsec Virtual Tunnel Interfaces 67

    C H A P T E R 3 SafeNet IPsec VPN Client Support 71

    Finding Feature Information 71

    Prerequisites for SafeNet IPsec VPN Client Support 72

    Restrictions for SafeNet IPsec VPN Client Support 72

    Information About SafeNet IPsec VPN Client Support 72

    Security for VPNs with IPsec Configuration Guide, Cisco IOS Release 15S v

    Contents

  • ISAKMP Profile and ISAKMP Keyring Configurations Background 72

    Local Termination Address or Interface 72

    Benefit of SafeNet IPsec VPN Client Support 73

    How to Configure SafeNet IPsec VPN Client Support 73

    Limiting an ISAKMP Profile to a Local Termination Address or Interface 73

    Limiting a Keyring to a Local Termination Address or Interface 74

    Monitoring and Maintaining SafeNet IPsec VPN Client Support 75

    Examples 76

    debug crypto isakmp Command Output for an ISAKMP Keyring That IsBound to

    Local Termination Addresses Example 76

    debug crypto isakmp Command Output for an ISAKMP ProfileThat Is Boundto

    a Local Termination Address Example 76

    show crypto isakmp profile Command Output Example 77

    Troubleshooting SafeNet IPsec VPN Client Support 77

    Configuration Examples for SafeNet IPsec VPN Client Support 77

    ISAKMP Profile Bound to a Local Interface Example 77

    ISAKMP Keyring Bound to a Local Interface Example 77

    ISAKMP Keyring Bound to a Local IP Address Example 78

    ISAKMP Keyring Bound to an IP Address and Limited to a VRF Example 78

    Additional References 78

    Related DocumentsStandards 78

    MIBs 79

    RFCs 79

    Technical Assistance 79

    C H A P T E R 4 Crypto Conditional Debug Support 81

    Finding Feature Information 81

    Prerequisites for Crypto Conditional Debug Support 82

    Restrictions for Crypto Conditional Debug Support 82

    Information About Crypto Conditional Debug Support 82

    Supported Condition Types 82

    How to Enable Crypto Conditional Debug Support 83

    Enabling Crypto Conditional Debug Messages 83

    Performance Considerations 83

    Disable Crypto Debug Conditions 84

    Security for VPNs with IPsec Configuration Guide, Cisco IOS Release 15S v

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